Sheffield United manager Kevin Blackwell has two major injury concerns for the first leg of his side's play-off semi-final at Preston.

Blackwell was keeping the identity of both players under wraps, but one will definitely miss the clash at Deepdale, while the other has a 50/50 chance of making it.

Otherwise, Blackwell has no new injury or suspension worries. Gary Naysmith is ruled out for up to seven months after damaging his cruciate ligament in the recent defeat at Burnley, so Kyle Walker could make only his fifth start for the Blades at full-back.

On-loan trio John Joe O'Toole, Craig Beattie and Arturo Lupoli are all hoping to play a bigger part after starting on the substitutes' bench at Palace along with Danny Webber.